CLASS A/F AMPLIFIER HAVING SECOND AND THIRD ORDER HARMONIC INPUT AND OUTPUT FILTERING AND SELF BIAS DISTORTION CORRECTION

摘要

A new class A/F amplifier has an filtering and matchinginput circuit, a summing junction, an amplifying circuit, afiltering and feedback biasing circuit, and an outputfiltering and matching circuit. The filtering and matchinginput circuit responds to a radio frequency access inputsignal, for providing a filtered and matched radio frequencyaccess input signal. The summing junction responds to thefiltered and matched radio frequency access input signal, andfurther responds to a filtering and feedback biasing signal,for providing a summed, filtered, matched and feedback radiofrequency access input signal. The amplifying circuitresponds to the summed filtered, matched and feedback radiofrequency access input signal, for providing an amplified,summed, filtered, matched and feedback radio frequency accessinput signal. The feedback and filtering biasing circuitresponds to the amplified, summed, filtered, matched andfeedback radio frequency access input signal, for providingthe feedback and filtering biasing signal. The outputfiltering and matching circuit responds to the amplified,summed, filtered, matched and feedback radio frequency accessinput signal, for providing an amplified, summed, filtered,matched and feedback radio frequency access output signal.The class A/F amplifier substantially reduces harmonics in theradio frequency signal that cause power interference betweenadjacent channels, resulting in greatly improved mobilecommunication service having much fewer dropped calls and anenhanced calling range.